单项选择题

The British constitution is a large extent a product of the historical events described above.

A．within
B．to
C．by
D．at
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单项选择题
I was ______ the point of telephoning him when his letter arrived.
A．to
B．on
C．at
D．in
单项选择题
Unexpectedly the light ______ and we were left in darkness.
A．burned out
B．put out
C．turned out
D．went out
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